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> Always plant about 10 percent more plants than you plan to harvest. If one in 10 plants can become infected or sickly, remove them from the garden. Removing entire plants is the easiest way to isolate and control most pest and disease problems.

>Plant insect and fungus resistant strains of marijuana. If buying seeds from one of the many seed companies, always check for disease resistance. In general cannabis indica is the most resistant to pests, and sativa’s more resistant to fungal attacks. When choosing mother plants, inspect them regularly for pest and disease resistance. I am always amazed when I see infested plants alongside healthy ones in the same garden.

>Keep plants healthy and growing fast at all times. Disease attacks sickly plants first. Strong plants tend to grow faster than pests and diseases can spread.

>Forced air circulation makes life miserable for pests and diseases. Pests hate wind. Holding on to plants is difficult and flight paths are haphazard. Fungal spores have little time to settle in a breeze and grow poorly on wind-dried soil, stems and leaves.

>Preventing pests and diseases is much easier and more productive than eliminating an infestation.

>Ventilation changes the humidity of a room quickly. In fact, a vent fan attached to a humidistat is often the most effective form of humidity control. Mold was a big problem in one of the grow rooms that I visited. The room did not have a vent fan. Upon entering the enclosed room, the moist humid air was overpowering. It was terrible! The environment was so humid that roots grew from plant stems. The grower installed a vent fan to suck out moist stale air. The humidity dropped from nearly 100 percent to around 50 percent. The mold problem disappeared and harvest volume increased

>Proper ventilation in your growing room is fairly important. The more plants you have in one room, the more important good ventilation becomes. Plants breathe through their leaves. The also rid themselves of poisons through their leaves.

>Always water with room temperature to lukewarm water. If your water has an excessive amount of chlorine in it, you may want to get some anti- chlorine drops at the local fish or pet store. The idea is to get the soil evenly moist all the way to the bottom of the pot.

>The important thing about watering is to see to it that the pot has good drainage. There should be some holes in the bottom so that any excess water will run out. If the pot won't drain, the excess water will accumulate in a pocket and rot the roots of the plant or simply make the soil sour or mildew.

>We have found that pruning is not always necessary. The reason one does it in the first place is to encourage secondary growth and to allow light to reach the immature leaves. Some strands of grass just naturally grow thick and bushy and if they are not clipped the sap moves in an uninterrupted flow right to the top of the plant where it produces flowers that are thick with resin.

>The pH should be between 6.5 and 7.5 since marijuana does not do well in acidic soil. High acidity in soil encourages the plant to be predominantly male, an undesirable trait.

>The ideal temperature for the light hours is 68 to 78 degrees Fahrenheit and for the dark hours there should be about a 10-15 degree drop in temperature. The growing room should be relatively dry if possible

The Resources come from:

1)  Indoor Marijuana Horticulture:The Indoor Bible

2)The Cannabis Grow Bible:
The Definitive Guide to Growing Marijuana
for Recreational and Medical Use